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That is, a song or other vocal or instrumental piece can be in the key of C major or A minor, but a song or some other piece cannot be in the key of B diminished or F augmented (although songs or other pieces might include these triads within the triad progression, typically in a temporary, passing role). Three of these four kinds of triads are ...
A major triad has a major third (M3) on the bottom, a minor third (m3) on top, and a perfect fifth (P5) between the outer notes. In harmonic analysis and on lead sheets, a C major chord can be notated as C, CM, CΔ, or Cmaj. A major triad is represented by the integer notation {0, 4, 7}.
A minor triad has a minor third (m3) on the bottom, a major third (M3) on top, and a perfect fifth (P5) between the outer notes. In harmonic analysis and on lead sheets, a C minor chord can be notated as Cm, C−, Cmin, or simply the lowercase "c". A minor triad is represented by the integer notation {0, 3, 7}.
A diminished triad can be viewed as a minor triad in which the perfect fifth has been substituted with a diminished fifth (6 semitones). In this case, the augmented triad can be named major triad sharp five, or major triad augmented fifth (M ♯ 5, M +5, maj aug5).
It comprises a major triad with the added major sixth above the root, common in popular music. [3] For example, the chord C 6 contains the notes C–E–G–A. The minor sixth chord (min 6 or m 6, e.g., Cm 6) is a minor triad, still with a major 6. For example, the chord Cm 6 contains the notes C–E ♭ –G–A.
Minor major seventh chord. A minor major seventh chord, or minor/major seventh chord (also known as the Hitchcock Chord) is a seventh chord composed of a root, minor third, perfect fifth, and major seventh (1, ♭ 3, 5, and 7). It can be viewed as a minor triad with an additional major seventh.
This E ♭ major triad is what would be called the upper structure. Considered in relation to the root C, the notes of this E ♭ major triad function, respectively, as the sharpened ninth (the root of the E ♭ major chord), fifth, and seventh in relation to that root.
The term "major scale" is also used in the names of some other scales whose first, third, and fifth degrees form a major triad. The harmonic major scale [4] [5] has a minor sixth. It differs from the harmonic minor scale only by raising the third degree.